Treatment of an open-cage fullerene, designated as MMK-9, with (Ph₃P)₄Pt in toluene solution at room temperature allows a (PPh₃)₂Pt unit to be incorporated into the rim of the cage so that it becomes an integral part of the carbon cage skeleton. The structure of the adduct has been determined by single crystal X-ray diffraction and reveals that the platinum atom has planar PtC₂P₂ coordination, rather than the usual η²-bonding to an intact C–C double bond of the fullerene.

中文翻译：

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通过破坏碳-碳键将 (Ph3P)2Pt 基团引入开笼富勒烯的边缘

在室温下用甲苯溶液中的(Ph ₃ P) ₄ Pt处理命名为 MMK-9 的开笼富勒烯，可以将 (PPh ₃ ) ₂ Pt 单元结合到笼的边缘，使其成为碳笼骨架的组成部分。加合物的结构已通过单晶 X 射线衍射确定，表明铂原子具有平面 PtC ₂ P ₂配位，而不是通常的 η ^{2 -}键合到富勒烯的完整 C-C 双键。